html,
body {
  height: 100%;
  margin: 0;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.chart {
  width: 600px;
  height: 600px;
  border: 1px solid #ccc;
}

.btns {
  margin-top: 20px;
}

fieldset {
  position: absolute;
  left: 50%;
  margin-left: 350px;

  label {
    cursor: pointer;
  }
}
